Air Squared is the industry leader in oil-free scroll compressor design and manufacturing. By introducing a simple and elegant design with fewer moving parts, scroll compressor technology offers OEM applications an oil-free, ultra-quiet and smooth-operating alternative to traditional reciprocating, diaphragm, and vain technology.

Air Squared, Inc. was founded in 1991 to service the needs of OEMs with oil-free scroll solutions for demanding positive displacement applications. Twenty years later, Air Squared is the industry leader in oil-free scroll design and manufacturing, with more experience and more scroll compressor models than any other company.

Range Capability Overview

Flow Rates100 – 3,000 lpm v
Pressures5 – 15 bar g

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Sales Inquires

Qualified OEMs should consult Air Squared for custom configurations and application specific requirements.

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Scroll Compressor Solutions from Air Squared

Find your oil-free solution through a growing line of liquid-cooled scroll compressors engineered specifically for OEMs and view past projects that supported liquid-cooled scroll technology development

While liquid cooling for oil-free and lubricated scroll compressor has been investigated in the past, patented liquid-cooled scroll technology from Air Squared offers the first oil-free scroll compressor design that provides effective cooling to both the fixed scroll and orbiting scroll. The patented technology allows coolant to be transferred between the fixed scroll and orbiting scroll without the use of dynamic seals.

Air-cooled scroll compressor designs are pressure-limited because the heat generated during compression causes the primary working components to thermally expand. The thermal expansion causes interference between the fixed scroll and orbiting scroll, eventually leading to mechanical failure. While the running clearance between the fixed scroll and orbiting scroll can be increased to avoid interference, this approach also decreases volumetric efficiency and pressure capability.

Liquid cooling allows for significantly more control over operating temperatures throughout the compression process. By removing heat generated during the compression process more effectively, thermal expansion is mitigated, allowing for high-pressure operation without sacrificing efficiency or reliability.

Sealed and Semi-hermetic configurations

Compared to air-cooled compressor designs, liquid cooling offers isolation of working fluid to ambient and drive componentry (i.e. motor). Air-cooled compressors cool the fixed scroll and orbiting scroll with ambient air. While this approach is adequate with an open-housing design, air colling is far less effective if the compression process is fully enclosed (e.g. sealed or semi-hermetic). Liquid-cooling solves this issue by providing effective cooling to the fixed scroll and orbiting scroll, even if the compressor is semi-hermetically sealed.

Liquid colling also operates independently of ambient conditions. This allows for effective cooling, even if the compressor is exposed to elevated ambient temperatures – as in under-the-hood vehicle applications.

For operation with flammable gases, such as O2 and H2, the “independent drive” series of liquid-cooled scroll compressors are easily configured with a magnetic coupling that fully isolates the working fluid from the motor.

Scroll Compressor Related Articles

    Scroll Compressor FAQs

    Monitoring speed is an important aspect of operating a scroll compressor or vacuum pump, as operation over the specified maximum speed can result in premature or catastrophic failure.

    For scroll compressors and vacuum pumps that have a brushless DC motor, speed can be measured by connecting a digital tachometer between a hall sensor and ground. The tachometer must be programmed to the correct number of pulses per revolution, which can be determined by dividing the numbers of motor poles by 2. For example, an 8-pole motor will have 4 pulses per revolution.

    Alternatively, an oscilloscope can also be used to measure the frequency of the hall sensors. Divide the measured frequency by the number of pulses per revolution and multiply by 60 to determine the RPM.

    For scroll compressors and vacuum pumps that have an AC motor, speed can be measured by multiplying the frequency of the variable frequency drive (VFD) by 60 to determine the RPM.

    Air Squared does not provide operation manuals for most products.

    Given the specialized nature of our scroll products, Air Squared works directly with OEM customers to install, operate, test, evaluate, and service products. Customers who require an operation manual should contact their Sales Representative.

    If you do not have a Sales Representative, start with our Application Assistant or contact Sales directly.

    Application Assistant

    Looking at the face of the unit, the motor shaft for scroll compressors and scroll vacuum pumps rotates clockwise.

    Most Air Squared products do not have a CE conformity marking.

    Our products are primarily designed for OEMs and not intended for end users. As most OEM systems already require CE marking, conformity specific to an Air Squared product is generally not required.

    OEM customers that require conformity specific to an Air Squared product should contact their Sales Representative.

    Most scroll compressors have a discharge port centered on the face of the unit, with the inlet port positioned near the periphery.

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